Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/25120
Title: Characteristics of corona-charged PET sandwich electrets
Authors: Tai, LS
Wong, YW
Poon, YM
Shin, FG
Keywords: Corona charging
Electrets
Hetero-charge
Homo-charge
PET
TSDC
Issue Date: 2005
Publisher: Trans Tech Publications Ltd
Source: Materials science forum, 2005, v. 480-481, p. 123-128 How to cite?
Journal: Materials science forum 
Abstract: Polyethylene terephthalate (PET) is one of the major electret materials which has been studied and widely used in charge storage applications for a long time. The homo-charge and hetero-charge formation responsible for the electret effect of PET can be explained by the dipolar polarization, space charge separation and charge injection respectively as a result of contact poling or corona charging. These processes are also verifiable from studies of surface charges and thermally stimulated depolarization current (TSDC) of the PET films. Now consider a stack of PET films charged under the same condition as a single film. It would be intuitively expected that the electret effects of the individual films of the stack should be different due to their different positions in the stack. However, in a recent study on charged PET stacks, it was found that the electret effects of the individual films are quite similar. The surface charges of the individual films are about the same and they sum to make same total as a single charged PET film. On the other hand, the TSDC thermograms of individual films show similar characteristics in the thermal relaxation processes where homo- and hetero- charge effects are still observed. From the TSDC results, especially for the film in the middle of a triple layer sandwich, it shows clearly dipolar polarization and charge injection related peaks. These findings agree with the results of surface charge studies of the individual films.
Description: 1st International Meeting on Applied Physics, APHYS-2003, Badajoz, 13-18 October 2003
URI: http://hdl.handle.net/10397/25120
ISBN: 0878499628
9780878499625
ISSN: 0255-5476
EISSN: 1662-9752
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